Egans, the existing wall was failing and without the anchors it would have taken out the new wall. Jimmy, the anchors are set using a hydraulic load locker. I attached to the rod and pull on it till it won't move anymore. If you google manta-ray earth anchor it will give you all the technical stuff. If there is a failure it will be round and round on who's fault it is. I'm confident that i did my part right.